# Learn Quaternions vs Understood In Spanish

The clearest difference is rating: Understood In Spanish at 5.0 against Learn Quaternions's 2.0. Learn Quaternions's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, ratings volume and device support there is nothing between them.

Both are free to download. Understood In Spanish sells 2 in-app purchases, starting at $0.99 per month. Learn Quaternions asks for nothing beyond the download.

Understood In Spanish holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

## The numbers

| Metric | Learn Quaternions | Understood In Spanish |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/learn-quaternions/id1560497809/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/understood-in-spanish/id6809186638/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Weekly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 125 MB |
| Requires iOS | **13.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Grant Jarvis](https://appshunter.io/developer/1475033835) | [Olivia Renee Studio, LLC](https://appshunter.io/developer/1823917643) |

## What reviewers say

### Learn Quaternions

[App page](https://appshunter.io/ios/app/learn-quaternions/id1560497809)

Explore the abstract mathematical concept of quaternions through an interactive, visual experience. Manipulate rotation angles and axes with sliders and touch gestures to understand their behavior in a fun and engaging way.

**Highlights:** Visual quaternion exploration, Interactive sliders for rotation, 3D scene manipulation via touch, Fun and engaging learning method, Built with RealityKit

**Features:** macOS Compatibility

**In-app purchases:** none


### Understood In Spanish

[App page](https://appshunter.io/ios/app/understood-in-spanish/id6809186638)

This app offers a comprehensive Spanish language course from beginner to advanced levels, featuring grammar explanations in your native language, speaking practice, and interactive exercises. All lessons are free to access, with optional ads and in-app purchases for an enhanced experience.

**Highlights:** 280 free lessons (A1-C2), Grammar explanations in 33 languages, Speaking and typing exercises, Spaced repetition review, Offline course access, Progress tracking

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Yearly | $5.99 | per year |


## Frequently asked questions

### Is Learn Quaternions free?

Learn Quaternions is free to download, with no in-app purchases.

### Is Understood In Spanish free?

Understood In Spanish is free to download, with in-app purchases available.

### Which has better reviews, Learn Quaternions or Understood In Spanish?

Understood In Spanish is rated higher. Learn Quaternions averages 2.0 out of 5 from 1 ratings, while Understood In Spanish averages 5.0 from 1 ratings.

### Do Learn Quaternions or Understood In Spanish have ads?

Understood In Spanish shows ads; Learn Quaternions does not.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*